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Topic: Crackled Glass Insulator (Read 360 times)

Crackled Glass Insulator. This is marked with a D in a diamond (dominion glass) then a dash (-42). I am from Canada. I thought I read that this may mean the year, as in 1942. Is this correct?

I have been told (?) that these are *misfired* when made. You can not feel any of the cracks on the inner, or outer surface...it is all smooth. The cracks are truly inside. Are this a misfired Insulator Glass?

Any comments/corrections about the age/maker/style/ and history and/or knowledge about crackled glass Insulators.